Features: 1.Carefully made and designed with good-quality materials to increase torsion and unparalleled hardness 2.The hardened chrome vanadium steel socket improves the rotation power and reduces wear 3.The product has complete rust and corrosion resistance, very durable 4.Come with comfortable-drill bit end with accurate chamfer for smooth insertion 5.The size is printed on the socket surface to speed up recognition Specification: Item Type: Square Wrench Hex Bit Socket Set Size: 1/4 Inch Square Wrench Interface: Approx. 2mm / 0.08in, 2.5mm / 0.1in, 3mm / 0.12in, 4mm / 0.16in, 5mm / 0.2in, 5.5mm / 0.22in, 6mm / 0.2in (37mm / 1.5in long) 3/8-Inch Square Wrench Interface: Approx. 7mm / 0.3in, 8mm / 0.3in, 9mm / 0.4in, 10mm / 0.4in, 12mm / 0.5in (48mm / 1.9in long) 1/2 Inch Square Wrench Interface: Approx. 14mm / 0.6in (55mm / 2.2in long) Applies To: 1/4in 3/8in 1/2in square wrench interface / jackhammer / power rod Application: Household, automotive PackageList: 13 x Square Wrench Hex Bit 1 x Blue Tool Box Note: Please allow 0?3mm error due to manual measurement. Thanks for your understanding.